simplify logic

this code solves a rare problem and could go in a separate PR after
discussion

the "unknown files" detection would support this scenario:

- a new config file or folder gets merged in without being included
  in filters.yml.
- time passes.
- a small pr modifies that config, breaking the ci job, which is skipped
  because filters.yml is out of date.

.github/filters.yml

@@ -21,6 +21,3 @@ npm-test:
   - '{.editorconfig,.prettier*,.stylelint*,.eslint*,coffeelint*}' # linters
   - '.gitignore'                                                  # (can affect tools)
   - '.github/workflows/npm-test.yml'                              # ci
-
-unknown: # return 'true' if a file was added but not listed here yet
-  - '!(((\.github|\.storybook|\.tx|cypress|dependencies|docker|hub|jsapp|kobo|kpi|patches|scripts|static|test|webpack)/**)|(\.babelrc\.json|\.browserslistrc|\.coveragerc|\.dockerignore|\.editorconfig|\.eslintignore|\.eslintrc\.js|\.git-blame-ignore-revs|\.gitattributes|\.gitignore|\.gitlab-ci\.yml|\.gitmodules|\.node-version|\.nvmrc|\.prettierrc\.js|\.stylelintrc\.js|\.swcrc|CONTRIBUTING\.md|Dockerfile|LICENSE|README\.md|coffeelint\.json|dependabot\.yml|format-python\.sh|kpi\.code-workspace|locale|manage\.py|package-lock\.json|package\.json|pip-compile\.sh|pyproject\.toml|tsconfig\.json))'

.github/workflows/ci.yml

@@ -16,7 +16,6 @@ jobs:
       darker:   ${{ steps.filter.outputs.darker   }}
       pytest:   ${{ steps.filter.outputs.pytest   }}
       npm-test: ${{ steps.filter.outputs.npm-test }}
-      unknown:  ${{ steps.filter.outputs.unknown  }}
 
   darker:
     needs: changes
@@ -26,13 +25,9 @@ jobs:
   pytest:
     needs: changes
     uses: ./.github/workflows/pytest.yml
-    if: |
-      needs.changes.outputs.pytest  == 'true' ||
-      needs.changes.outputs.unknown == 'true'
+    if: needs.changes.outputs.pytest == 'true'
 
   npm-test:
     needs: changes
     uses: ./.github/workflows/npm-test.yml
-    if: |
-      needs.changes.outputs.npm-test == 'true' ||
-      needs.changes.outputs.unknown  == 'true'
+    if: needs.changes.outputs.npm-test == 'true'